<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        ul {
            list-style: none;
        }
        body {
            background-color: black;
        }
        .c-nav {
            width: 900px;
            height: 42px;
            background: #fff url() no-repeat right center;
            margin: 100px auto;
            border-radius: 5px;
            position: relative; 
        }
        .c_nav ul{
            position: absolute;
        }
        .c-nav li {
            float: left;
            width: 83px;
            text-align: center;
            line-height: 42px;
        }
        .c-nav li a {
            color: #333;
            text-decoration: none;
            display: inline-block;
            height: 42px;
        }
        .c-nav li a:hover {
            color: white;
        }
        .c-nav li.current a {
            color:#0dff1d;
        }
        .cloud {
            position: absolute;
            left: 0;
            top: 0;
            width: 83px;
            height: 42px;
            
            background: url(images/cloud1\(1\).png) no-repeat;
        }
    </style>
    <script src="animate.js"></script>
    <script>
        window.addEventListener('load', function(){
            //1.获取元素
            var cloud = document.querySelector('.cloud');
            var c_nav = document.querySelector('.c-nav');
            var lis = document.querySelectorAll('li');
            //2.给所有的小li绑定事件
            //这个current作为筋斗云的起始位置
            var current = 0;
            for(var i = 0; i < lis.length; i++){
                //(1)鼠标经过把当前的小li的位置作为目标值
                lis[i].addEventListener('mouseenter',function(){
                    animate(cloud, this.offsetLeft);
                })
                //(2)鼠标离开就回到起始的位置
                lis[i].addEventListener('mouseleave',function(){
                    animate(cloud, current);
                })
                //(3)当我们鼠标点击，就把当前位置作为目标值
                lis[i].addEventListener('click', function(){
                    current = this.offsetLeft;
                })
            }
        })
    </script>

</head>
<body>
    <div id="c_nav" class="c-nav">
        <span class="cloud"></span>
        <ul>
            <li class="current"><a href="#">首页新闻</a></li>
            <li><a href="#">师资力量</a></li>
            <li><a href="#">活动策划</a></li>
            <li><a href="#">企业文化</a></li>
            <li><a href="#">招聘信息</a></li>
            <li><a href="#">公司简介</a></li>
            <li><a href="#">我是领导</a></li>
            <li><a href="#">关于我们</a></li>
        </ul>
    </div>
</body>
</html>